AFAIK a wolf tone is where the resonant frequency of the string / bridge / bass body combination feed back to the string and partially cancel. This can most easily be altered by adjusting the resonant frequency of the string afterlength (adding a brass weight most commonly). From this theory a groove in the fingerboard shouldn't create a wolf tone. It can create annoying buzzing though, so if that is the case then dressing would help.
You can check for a wolf tone by bowing / plucking the notes around the one you suspect with a short sharp hard attack, and watching the string excursion. If you hit a note hard, then the string vibration just dies instantly, you have a wolf tone. The note almost "implodes" on you. It shoud sustain nicely and evenly.
A buzz on the other hand could be fingerboard, nut, bridge, low action...
Hope that helps...!
Simon